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Because Chris has spoken in celcius we will break it down a little for anyone wondering about the temp drop/difference in farenheit.

26c day (78.8f)
6c IAT (42.8f)
finish line IAT 32c (89.6f)

Temperature under ambient = 20c (36f)
This will get even colder when the engine fans are turned on full, intercooler hoses are insualted, faster intercooler pump and then even colder than that again if stage 2 were to be installed.